See changes in xml-format.md or wiki (dynamic cohorts v1) for spec.

Includes adding a method for css_click_at.

  - ops view for the desktop app to talk to
  - xmodule that talks to the foldit model and displays the student's state
  - grading tweak to make grade updates from an external service work:
    - Add an always_recalculate_grades property to XModuleDescriptor.

When checking types to convert data, don't forget about longs.  32-bit Pythons make longs from values that are ints on 64-bit Pythons.

Conflicts:
	common/djangoapps/util/converters.py

- regexp was too complicated, didn't work

- needed for GWT'ed modules that rely on the filename to find dependencies

This reverts commit e4819a1b, reversing
changes made to b6ec41ca.

Now that we're ready to test again, need to revert the revert to put the filtering UI back in.

This reverts commit 66889b87, reversing
changes made to 0dd9c24e.

This was merged too early--it's still missing the filtering and display-your-cohort changes.
Will need to revert this revert later.

Switch timed_module to store location, and use to navigate from timer when timer displays on non-exam course pages.

Make local dev work by trying checking staticfiles_storage for both the course_prefixed and non-course_prefixed urls

change from throwing a Http404 exception, which I believe will try to render a static 404.html template - and ironically triggers a 500 server error. Just create a HttpResponse and set the status_code to 404.